Insights

Strategic Growth 4xxi has a strong track record in launching startups and delivering high-impact products with clients that have collectively raised over $500M, indicating strong partner alignment potential for early-stage funding rounds and growth-focused engagements.

Global Delivery With 12+ years in multiple markets (US, UK, VC hubs, Asia, Europe) and a London HQ, there is a clear capability to support multinational clients, scale teams quickly, and manage geographically distributed projects for enterprise clients.

Tech Capabilities Full-stack offerings spanning Backend, Frontend, DevOps, AI/ML, and Mobile development, backed by a modern tech stack, position 4xxi to pursue end-to-end modernization, digital transformation, and AI-enabled product initiatives.

Industry Visibility Publications in TechCrunch, Forbes, Business Insider, NY Times, and Wired, plus recognition as a top web development firm, suggest credibility and press leverage to support outreach to mid-market and enterprise prospects.

Strategic Initiatives Active startup competitions and partnerships with major ecosystems (WeWork, Barclays, F6S, 11FS, Capital Enterprise, VCs) indicate opportunities to collaborate on accelerator programs, co-innovation, and scoping partnerships for growth-stage ventures.

Similar companies to 4xxi

4xxi Tech Stack

4xxi uses 8 technology products and services including HubSpot Analytics, Amazon Web Services, Unpkg, and more. Explore 4xxi's tech stack below.

4xxi's Email Address Formats

4xxi uses at least 4 email formats:
4xxi Email FormatsExamplePercentage
FLast@4xxi.comJDoe@4xxi.com
71%
FL@4xxi.comJD@4xxi.com
17%
Last@4xxi.comDoe@4xxi.com
8%
LF@4xxi.comDJ@4xxi.com
4%

Frequently Asked Questions

What is 4xxi's official website and social media links?

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4xxi's official website is 4xxi.com and has social profiles on LinkedIn.

How much revenue does 4xxi generate?

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As of October 2026, 4xxi's annual revenue is estimated to be $1B - $10B.

What is 4xxi's NAICS code?

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4xxi's NAICS code is 5415 - Computer Systems Design and Related Services.

How many employees does 4xxi have currently?

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As of October 2026, 4xxi has approximately 21 employees across 3 continents, including Europe, Asia and North America. Key team members include Ceo: E. T., Chief Product Officer: E. S. and Founder: E. S. Explore 4xxi's employee directory with LeadIQ.

What industry does 4xxi belong to?

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4xxi operates in the IT Services and IT Consulting industry.

What technology does 4xxi use?

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4xxi's tech stack includes HubSpot Analytics, Amazon Web Services, Unpkg, Google Workspace, Node.js, reCAPTCHA, Piwik and Facebook.

What is 4xxi's email format?

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4xxi's email format typically follows the pattern of FLast@4xxi.com. Find more 4xxi email formats with LeadIQ.

When was 4xxi founded?

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4xxi was founded in 2008.
4xxi logo

4xxi

IT Services and IT ConsultingEngland, United Kingdom11-50 Employees

4xxi is a London-based IT services and consulting firm that focuses on helping startups launch and develop products that transform industries. The company emphasizes creating products that genuinely make a difference, drawing on more than 15 years of experience across a range of notable projects. Its service offerings include backend development, frontend development, DevOps, AI/ML solutions, and mobile development.

Headquartered in London, the firm has operated in global markets for more than 12 years, including the United States, the Virgin Islands, Asia, and Eastern and Western Europe, and has completed over 100 projects. Its client base comprises startups and other ventures seeking engineering and product development support, and it runs startup competitions in London through partnerships with organizations such as WeWork, Barclays, F6S, 11FS, Capital Enterprise, and venture-capital firms.

Section iconCompany Overview

Website
4xxi.com
NAICS Code
5415 - Computer Systems Design and Related Services
Founded
2008
Employees
11-50

Section iconFunding & Financials

  • $1B - $10B

    4xxi's revenue is estimated to be in the range of $1B - $10B

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